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1 wrench, design press 128 bar and 80 bar respectively,temp @ ambient 20°c but probably less in conditions,youre probably right unclesyd about more wrenches but conditions don't lend themselves to using more could it be a gasket issue like vessleflab says.torque settings came from gasket supplier.

also using copperslip on threads to get max load on bolts.

HI GUYS,FLANGES ARE ASME B16.5 STANDARD ,TIGHTENING SEQUENCE IS 180° OPPOSITE AT 30% ,60%,100% 0F TORQUE. MAX TORQUE FOR 2 3/4 '' bolts 10250Nm .BOLTS AND STUDS ARE B7 2H

forgot to say they are carbon steel flanged raised face

hi guys,could anybody outthere help me,im having alot of trouble sealing off fabricated venturis for pressure testing sizes are 36'' 900Lb, 48'' 6oolb test pressures 206bar and 120 bar using spiral wound graphite filled gasket onto scrolled faces, bolts are 2 1/2'' and 2 3/4''. i am using...